Lower current CT's?

[Damic]

Hi;

why aren't there lower current CT's like 25A? I like the 3EM and PRO50 but it would be nice to chose with lower value CT's.

As an example my own home:

• main breaker is 1phase 40A (but I can upgrade to 3x25A)
• al the rest is 20A (of 16A for lights)

Or I for-see every group I want to monitor with a PM mini, or I could take a 3EM/PRO50 and have 25A CT's on it = less main devices in the cabinet

What would Shelly think of that?

*CT: current transformer

[tvbshelly]

Why not also measure the lower currents with 50A or 120A CTs?

For example, I use a PRO 3EM with 120A CTs to measure my three-phase PV system, which has a maximum of 16A per phase and the measured values are correct.

[Damic]

Yes you can do that, but on lower currents the tolerance is way worse.

[thgoebel]

Transmission ratio of both current clamps is 1:3000. Τhus, the secondary current is the same with both types. Only the saturation limit of the ferrit core is different. 

Edited August 19 by thgoebel